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<td ><a href="../qtdoc/index.html">Qt 5.12</a></td><td ><a href="qtqml-index.html">Qt QML</a></td><td ><a href="qtqml-qmlmodule.html">QML Types</a></td><td >LoggingCategory QML 类型</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtqml-index.html">Qt 5.12.3 参考指南</a></td>
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<h3><a name="toc">目录</a></h3>
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<li class="level1"><a href="#properties">属性</a></li>
<li class="level1"><a href="#details">详细信息</a></li>
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<h1 class="title">LoggingCategory QML 类型</h1>
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<!-- $$$LoggingCategory-brief -->
<p>Defines a logging category in QML. <a href="#details">更多...</a></p>
<!-- @@@LoggingCategory -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> 导入语句<span lang="zh-cn">：</span></td><td class="memItemRight bottomAlign"> import QtQml 2.12</td></tr><tr><td class="memItemLeft rightAlign topAlign"> 
	<span lang="zh-cn">从：</span></td><td class="memItemRight bottomAlign">  Qt 5.8</td></tr></table></div><ul>
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<h2 id="properties">属性</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtqml-loggingcategory.html#defaultLogLevel-prop">defaultLogLevel</a></b></b> : enumeration</li>
<li class="fn"><b><b><a href="qml-qtqml-loggingcategory.html#name-prop">name</a></b></b> : string</li>
</ul>
<!-- $$$LoggingCategory-description -->
<a name="details"></a>
<h2 id="details">详细信息</h2>
<p>日志类别可以作为第一个参数传递给console.<a href="../qtdoc/qtquick-debugging.html#log">log()</a>和friends。如果提供给日志记录器，<a href="qml-qtqml-loggingcategory.html">LoggingCategory</a>的名称将被用作日志类别，否则将使用默认的日志类别。</p>
<pre class="qml">

  import QtQuick 2.8

  <span class="type"><a href="../qtquick/qml-qtquick-item.html">Item</a></span> {
      <span class="type"><a href="qml-qtqml-loggingcategory.html">LoggingCategory</a></span> {
          <span class="name">id</span>: <span class="name">category</span>
          <span class="name">name</span>: <span class="string">&quot;com.qt.category&quot;</span>
          <span class="name">defaultLogLevel</span>: <span class="name">LoggingCategory</span>.<span class="name">Warning</span>
      }

      <span class="name">Component</span>.onCompleted: {
        <span class="name">console</span>.<span class="name">log</span>(<span class="name">category</span>, <span class="string">&quot;message&quot;</span>);
      }
  }

</pre>
<p><b>注意： </b>由于创建对象的开销很大，所以建议将所需的<a href="qml-qtqml-loggingcategory.html">LoggingCategory</a>定义放到一个单例中，并在需要的地方导入它。</p><p><b>请参考 </b><a href="../qtcore/qloggingcategory.html">QLoggingCategory</a><span lang="zh-cn">。</span></p>
<!-- @@@LoggingCategory -->
<h2>属性的文档</h2>
<!-- $$$defaultLogLevel -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="defaultLogLevel-prop">
<td class="tblQmlPropNode"><p>
<a name="defaultLogLevel-prop"></a><span class="name">defaultLogLevel</span> : <span class="type"><a href="qml-enumeration.html">enumeration</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>保存日志类别的默认日志级别。默认情况下，它是用<a href="qml-qtqml-loggingcategory.html">LoggingCategory</a>创建的。调试日志级别。</p>
<p><b>注意： </b>该属性需要在声明<a href="qml-qtqml-loggingcategory.html">LoggingCategory</a>时设置，以后不能更改。</p><p>
		这个属性在Qt 5.12中被引入。</p>
</div></div><!-- @@@defaultLogLevel -->
<br/>
<!-- $$$name -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="name-prop">
<td class="tblQmlPropNode"><p>
<a name="name-prop"></a><span class="name">name</span> : <span class="type"><a href="qml-string.html">string</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>保存日志类别的名称。</p>
<p><b>注意： </b>该属性需要在声明<a href="qml-qtqml-loggingcategory.html">LoggingCategory</a>时设置，以后不能更改。</p><p><b>请参考 </b><a href="../qtcore/qloggingcategory.html#categoryName">QLoggingCategory::categoryName()</a><span lang="zh-cn">。</span></p>
</div></div><!-- @@@name -->
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